Perhaps you should try some spelling variations:
nang luong » nang song
luong quan » thong quan, duong qua
quan trong » gian trong
hieu lang » chieu sang, hieu quang, nhieu tang
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu
ho hieu » ho chieu, hoi hieu, nho hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - nang luong quan trong ((cong dan) OR (cong san)) ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - nang luong quan trong ((cong dan) OR (cong san)) ((than cau) OR (phan cau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - nang luong quan trong ((cong dan) OR (cong san)) ((than cau) or (phan cau))*".